Lawrence, the basis of the J1772 standard is that the *EVSE* tells the EV how much it is allowed to draw. If you take an EVSE designed for a 40A service, so it knows it can draw 32A continuous, it will tell the EV in its pilot signal that the car can draw up to 32A and depending on the capabilities of the car, it might draw a lower amount (as you found out with your 3kW Leaf) or the allowed 32A. The only way the car will draw less, is when it is told to draw less. So, you need to modify the Pilot signal of this EVSE or use a different EVSE that tells the EV to draw less than 20A. For example, if you take your Nissan OEM trickle charger and modify it for 240V then it will still tell the car to draw max 12A, and since you can supply 240V, the car will draw up to 2.9kW by limiting its charger to 12A. If you use a JuiceBox you can choose the max pilot signal. There are already a few JuicePlugs out, this is a short J1772 to J1772 "adapter" that can modify the pilot signal to make the car draw less (or nothing) at times that the cost of electricity is high and draw max power when there is surplus power. But there are plenty 16A or 20A EVSE that are even portable so you can use that in addition or as replacement of your Nissan OEM trickle charger. I have made two friends happy with the 20A ClipperCreek LCS-25 which needs a 25 or 30A breaker and its pilot tells the car to draw 20A, it is very portable and easy to plug into a dryer outlet to get 4.8kW into the car. I just added a NEMA 14-30 plug to its wire pigtail and they use it as EVSE at home and on the road. Success!
Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info http://www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of Lawrence Rhodes via EV Sent: Saturday, December 24, 2016 9:58 PM To: [email protected]; [email protected] Subject: Re: [EVDL] J1772 might not go to a low level but just trip breaker. Is there any way I can tell the Leaf to only draw 20 amps? The EVSE is certainly not doing it. Remember I am using an EVSE designed for the Ford Th!nk. Avcon standard which is supposed to be the same a J1772. It has worked well with both the 3.3kw Leaf and the 6.6kw Leaf. The problem is in Modesto we still have the old 220vac 20 amp circuit and we have to charge there. We don't have the 3,3 kw Leaf anymore. I was skeptical that the EVSE can do this and I seem to be proved right even though my new Leaf's have both the 6.6 and 3.3 charge cycles on the dash. Has anyone ever tried to plug their EVSE into a 20 amp circuit with a 6.6kw EV? . Lawrence Rhodes -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20161225/b019ca91/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
